Compositions for drying solid surfaces

Abstract

A drying composition according to the invention is composed of a solution of a surface-active agent in a mixture of a fluorinated hydrocarbon and of a polyfluorinated alcohol of formula: Rf—(CH 2 ) n —OH  (I) in which n is equal to 1 or 2 and Rf represents a linear perfluoroalkyl radical containing from 2 to 8 carbon atoms.

1. A water-removing dewetting composition, consisting essentially of a solution of between 0.01 and 0.5% by weight of at least one surface-active agent in a mixture of at least one fluorinated solvent and from 2% to 30% by weight of at least one water-immiscible polyfluorinated alcohol of formula:
   R f —(CH 2 ) n —OH  (I)  
 
       in which n is equal to 1 or 2 and R f  represents a linear or branched perfluoroalkyl radical containing from 4 to 8 carbon atoms,
 wherein said composition does not exhibit a flash point under standard determination conditions (ASTM standard D 3828),  
 further wherein the fluorinated solvent is selected from the group consisting of 1,1,1,3,3-pentafluorobutane, 1,1,1,2,2,4,4-heptafluorobutane, 1,1,1,2,3,4,4,5,5,5-decafluoropentane, 1,1,1,2,2,3,3,4,4-nonafluorohexane, 1H-perfluorohexane, n-perfluorohexane, (perfluorobutyl) ethylene and perfluoro (methylmorpholine);  
 further wherein the surface-active agent is a cationic surface-active agent obtained by reaction of a mono- or dialkylphosphoric acid of formula: 
   (RO) p (HO) 2-p PO 2 H  (II)  
 
 
       in which p is a number ranging from 1 to 2 and R denotes a linear or branched alkyl radical containing from 1 to 18 carbon atoms, with a quaternary ammonium chloride of formula:
   R′ 2 N + R″ 2 Cl −   (III)  
 
       in which R′ and R″, which are identical or different, each represent a hydrogen atom or an alkyl or hydroxyalkyl radical containing 1 to 4 carbon atoms, and a fluorinated amine of formula:
   R f —X—NR 1 R 2   (IV)  
 in which R f  represents a linear perfluoroalkyl radical containing from 2 to 20 carbon atoms, X represents a divalent bridge and the symbols R 1  and R 2 , which are identical or different, each represent a hydrogen atom or an alkyl or hydroxyalkyl radical containing 1 to 4 carbon atoms.  
 
     
     
       2. The composition according to  claim 1 , wherein the composition contains at least one alcohol of formula (I) in which n is equal to 2. 
     
     
       3. The composition according to  claim 1 , wherein the alcohol of formula (I) is tridecafluorooctanol (C 6 F 13 CH 2 CH 2 OH). 
     
     
       4. The composition according to  claim 1 , wherein the fluorinated solvent has a normal boiling point of between 20 and  100° C.    
     
     
       5. The composition according to  claim 4 , wherein the boiling point of the fluorinated solvent is between 30 and  75° C.    
     
     
       6. The composition according to  claim 1 , wherein R is butyl, hexyl, 2-ethylhexyl, octyl or tridecyl radical, R′ is a dodecyl or octadecyl radical, R″ is a methyl radical, X is a —CH 2 CH 2 SO 2 NHCH 2 CH 2 — or C 2 H 4 CONHCH 2 CH 2 — bridge and R 1  and R 2  are methyl radicals. 
     
     
       7. The composition according to  claim 1 , wherein said composition is in the form of a concentrate containing up to 30% by weight of surface-active agent(s). 
     
     
       8. The method for dewetting of solid surfaces comprising treating a solid surface with the composition of  claim 1 . 
     
     
       9. The composition according o  claim 1 , wherein the content of polyfluorinated alcohol(s) is from 2% to 5%. 
     
     
       10. The composition according  claim 1 , wherein the content of the surface-active agent(s) is between 0.04 and 0.2%. 
     
     
       11. A water-removing dewetting composition, consisting essentially of a solution of at least one surface-active agent in a mixture of at least one fluorinated solvent and from 2% to 30% by weight of at least one water-immiscible polyfluorinated alcohol of formula:
   R f —(CH 2 ) n —OH  (I)  
 in which n is equal to 1 or 2 and Rf represents a linear or branched perfluoroalkyl radical containing from 4 to 8 carbon atoms,  
 wherein the surface-active agent consists of a cationic surface-active agent obtained by reaction of a mono- or dialkyl phosphoric acid of formula: 
   (RO) p (HO) 2-p PO 2 H  (II)  
 
 in which p is a number ranging from 1 to 2 and R denotes a linear or branched alkyl radical containing from 1 to 18 carbon atoms, with a quaternary ammonium chloride of formula: 
   R′ 2 N + R″ 2 Cl −   (III)  
 
 in which R′ and R″, which are identical or different, each represent a hydrogen atoms or an alkyl or hydroxyalkyl radical containing 1 to 4 carbon atoms, and a fluorinated amine of formula: 
   R f —X—NR 1 R 2   (IV)  
 
 in which R f  represents a linear perfluoroalkyl radical containing from 2 to 20 carbon atoms, X represents a divalent bridge and the symbols R 1  and R 2 , which are identical or different, each represent a hydrogen atom or an alkyl or hydroxyalkyl radical containing 1 to 4 carbon atoms;  
 further wherein said composition does not exhibit a flash point under standard determination conditions (ASTM standard D 3828), further wherein the fluorinated solvent is selected from the group consisting of 1,1,1,3,3-pentafluorobutane, 1,1,1,2,2,4,4-heptafluorobutane, 1,1,1,2,3,4,4,5,5,5-decafluoropentane, 1,1,1,2,2,3,3,4,4-nonafluorohexane, 1H-perfluorohexane, n-perfluorohexane, (perfluorobutyl) ethylene and perfluoro (methylmorpholine).